@startuml

skinparam linetype ortho

state Client {
    state HTML
    state CSS
}

state Server {
    state Thymeleaf
    state H2_Database
    state ApplicationLogic {
        state Controller : - CatalogController
        state Controller : - CustomerController
        state Controller : - InventoryController
        state Controller : - OrderController

        state Catalog
        state Order
        state Customer
        state Inventory
    }
    Controller --> Thymeleaf
    Thymeleaf --> HTML
    Thymeleaf --> CSS
}

@enduml